Teledyne 501 TRS, Operation Manual, Page: 57 / 111

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10.
THEORY OF OPERATION
The T102 is a modified T101 which, when used in conjunction with a M501-TRS
determines the concentration of total reduced sulfur (TRS), in a sample gas drawn
through the instrument In most ways the theory of operation of the T102 & M501-TRS
system is identical to the T101 theory of operation as described in the
Theory of
Operation Chapter in the T101 Manual - PN 07266.
This section describes those areas where differences between the T102 and the T101
exist as well as updated information made available since the publication date of the
T101 Manual - PN 07266.
10.1.
Measurement Principle
This section supersedes the Measurement Principle section in the T101 Manual - PN
07266
10.1.1.
TRS Conversion
The T102 TRS analyzer is basically an SO
2
analyzer with a TRS

SO
2
converter (the
M501-TRS) inserted into the gas stream before the sample gas enters the sample
chamber.
The M501-TRS, receives sample gas from the T102 after it has been passed through a
particulate filter and has been scrubbed of hydrocarbon interferents. Once inside the
M501-TRS the sample gas is scrubbed of all naturally occurring SO
2
, then passed
through a special quartz converter which heats the gas to a very high temperature
causing it to react with the O
2
present in the sample gas creating SO
2
in the following
manner .
TRS + O
2

SO
2
Equation 10-1
For TRS compounds, the converter is most efficient when it operates at 850°C,
converting >95% of the TRS into SO
2
. The converter temperature is viewable via the
front panel of the M501-TRS
When the converter is operating at peak efficiency there is a nearly 1:1 relationship
between the amount of TRS entering the converter and the amount of SO
2
leaving it.
Therefore, by measuring the amount of SO
2
in the gas after it leaves the converter, the
amount of TRS originally present on the sample gas can be directly inferred.
07267B DCN6485